Kathmandu has a subtropical highland climate, classified as Cwa in the Köppen system. The warmest month is May with an average high of 26°C, while the coldest month is January with lows dropping to 7°C. The annual temperature range of 19°C reflects moderate seasonal variation.
The driest month is December with only 3 rain days and 19mm of precipitation. For travellers, December through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 70% to 70% throughout the year.
Best Time to Visit Kathmandu
Based on temperature and rainfall data, the best months to visit Kathmandu are December, January, February. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
In May, Kathmandu experiences average highs of 26°C (79°F) and lows of 17°C (63°F). Expect around 22 rainy days and 12 hours of sunshine per day, with humidity averaging 70%. The 9°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 9, so sun protection is advisable on clear days.
Kathmandu typically sees 22 rainy days in May, with total precipitation of around 203mm. This is a notably wet period. A waterproof jacket or compact umbrella is essential, and it is worth building indoor alternatives into your daily itinerary for the inevitable rainy stretches. For context, the driest month in Kathmandu typically sees 4-6 fewer rain days than May.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Kathmandu in May. Daytime temperatures of 26°C are pleasant, but the evening drop to 17°C means a jacket is essential if you plan to be out after dark. With 22 rainy days, bring a compact umbrella or waterproof jacket for unexpected showers. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
May is a reasonable time to visit Kathmandu. Expect 22 rainy days, so pack a light rain layer for flexibility. Average temperatures of 26°C make outdoor exploration comfortable during the dry periods. With 12 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Kathmandu in May is 26°C (79°F), and the average low is 17°C (63°F). The mean daily temperature is approximately 22°C (71°F). The day-to-night range of 9°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Kathmandu is generally March. March offers the most sunshine at 11 hours per day and only 10 rainy days. Average temperatures reach 22°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around March gives you the best chance of dry, bright weather.
May is shoulder or low season in Kathmandu, meaning fewer tourists and generally lower prices than peak months. With 12 sunshine hours and 22 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In May, Kathmandu suits a range of activities thanks to mild temperatures around 26°C. With frequent rain, indoor activities and covered attractions are a smart choice. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 12 hours of sunshine, parks and waterfront walks are particularly enjoyable.